[#mp_units-quantity-01-operator_minus]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity-01.adoc[quantity]::operator‐
:relfileprefix: ../../
:mrdocs:

== Synopsis

Declared in `<mp‐units/framework/quantity.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
constexpr
xref:mp_units/QuantityOf.adoc[QuantityOf<quantity_spec>] auto
operator‐() const
requires requires(const rep v) {
      { ‐v } ‐> std::common_with<rep>;
    };
----


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